Typewriting machine



May 10, 1927.

G. w. CAMPBELL TYPEWRITING MACHINE Original Filed May 10, 1922 iiilllllllilllllgu wllq Af/ame Patented ,May 10, 1927.

anan TES- P ATE NT O FFIC'E.

shorten W:. GK1YJ;P1ilELL-,- or" gametes, confinement, assle iro'a To qapqiawoon JEYI EWEITER- cbMPA-N-Y} or New YORK, N. A CORPORATION 01 DELAWARE.

TYI EWRITING' MACHINE,

Continuation of application Srial No; 559,693, filed. May 10,1922.

This application filed March 31, 1924.-

Serial No. 7033090.

The present invention relates to sounddeadening casings for typewrit'ing machines; and more particularly to -the type of casing into which the machine is inserted from the top; the casing having a cover which may be opened to permit of placement and removal of the machine, and to permit of access to the machine for erasures and other purposes. Casings of the character inentioned have been provided with ,SPI iHg Cl GVlCQS for assist ing in opening the casingcover.

[in object of the invention is the provision of a spring-device, for auton'iaticailly swinging open the casing-cover, turning the same around pivots at the rear of the casing,-

wh-enever the cover isunloched, and the provision of a buffer to check the rebound of the cover, when opened, such spring device being adjustable as to the-tension thereof, to accord to the weight and leverage involved; also to accord tovariable frictional resistance at the casing-joints and to accord g l. to the action 0t said butter which 1860111 b ned' therewith to prevent shocks due to the momentum of the moving, parts duringthe cover-opening operation. I

Other objects are to have the connections of said casing-cover with said spring-device comparativelylight, and=to have said springdevice with the connections thereof to the" sectional side elevation, of the upper part oi the casing, the upper part of the machine being indicated in dot-and-daslr lines there% in.

FigureQ is a broken view, in cross-sectional side elevation, of the casing, partly open, and showing the cover-opening device.

Figure 3: is a fragmentary top plan view of the overhanging: portion at the left side of: the casing-body;- the casing-cover being shown, in part, with the top thereof broken- Serial" No.-

away to illustrate the connection thereto of the cover-openingdevice, which is shown indetail.

The casing is shown a-s coniprising two principal castings, one or which- 10' constitutes the body-part of; the casing,- and the other of which 11 constitutes a. cover hinged at 12 to the body-portion. The body-part and covercastings have linings 14 and 15,- respectively, of sound-deadening material, Thecover 11 of the casing is provided with a window-pane 18, of glass or other transparent material, to permit the operator to observe thcprinting efiected within the easing. The pane 18 is held in an opening. in the cover-casting 11 in any suitable manner.

The typewriter-Carriage 25 is mounted to have letter-feed and return movements on the main frame of the machine, and has mounted thereon a carriage-release-lever 26, a line-sp'ace-lever 27, and a carriage-returnarm 28. In Figure 1, these levers are shown as projecting to the outside of the front: wall of the casing, so as to be accessible to the operator. Since these levers must move with the carriage, the front wall of the casing must beslotted horizontally and longitudinally thereof. In Figure 1, this slot is shown at 29 as formed by a bead 30' on the forward lower edge or" the cover 11 and by a head 31 on the upper edge of the front wall24; of the casing-body 10. The slot 29'is, however, practically closed by two resilient; flexible cushions 32 and 33; the cushion 32 being attached to the head 30 on the cover 11,- and the cushion 33 being attached to the head 31 on the front wall of the casing-body 10. The cushions, in effect, close the slot 29, being in contact with each other except where the levers 26, 27 and 28 protrude between the same. The yieldable, flexible character of the cushions permits movement of the levers therealong as the carriage is moved in one or the other direction.

The overhanging portions 50 of the easing-body, one of which is shown in Figure 3, are for the-well known purpose of providing space for movement of the carriage on the machine and, for the same reason, the cover 1 1 is of the width represented by the" overhangs 50, rather than of t he width represented by the lower portion of the cas=. ing-body, which is not shown in the drawings.

For causing the cover automatically to open, when not restrained by the locking device, hereinafter described, there is provided a spring-device consisting of an arm 51, pivot-ed on a shaft 52, one end of which shaft is shown as fixed in an ear 53, formed on the casting 10, by means of a screw 53 (see Figure 3), and the other end of which shaft is fixed in a recess in the left ender cannot be jammed against the boss 57,

but will turn freely on the pin 56, so as to eliminate frictional engagement with the cover-lifting arm 51.

At its rear end 59, the arm 51 has pivotal bearing on the shaft 52. The right-hand face of the boss on the arm, through which the shaft 52 passes, is toothed, thereby forming a clutch, as indicated at 60, in Fig ure 3, which clutch engages a converselytoothed clutch on the collar 61, forming part of a sleeve 63, which is mounted both to slide and to rotate on the shaft 52. Embracing the shaft 52 and the sleeve 63 is a coiled spring 64, one end 65 of which passes through an opening in the hereinbefore-described lug or ear 53 in the rear wall of the body-casting, and is thus anchored to the body of the casing.

The other end 66 of the spring 64 enters and is held in a recess in the collar 61, as shown at 64 in Figure 3. The spring 64, which is shown in Figure 3 as coiled in a left-hand direction, is initially compressed and also strained by torsion, and it tends to unwind in a right-hand direction and also to urge the collar 61, with the clutch thereon, toward the clutch at the end 59 of the arm 51, thereby causing the opposing sets of teeth in these two clutches to engage one another and to remain in engagement.

The teeth on each of the two sets, which are thus in engagement with each other, are buttressed and so directed that there is no tendency of the set of teeth on the clutch of the collar 61 under the influence of the spring 64 to cam itself out of engagement with the set of teeth on the clutch at the end 59 of the arm 51.

The collar 61 may, however, be turned in a left-hand direction (thereby still further increasing the torsional strain of the spring 64) by means of a pin or lever inserted at one end thereof into one of the openings 62 on the periphery of the collar 61. During this turning of the collar 61, the teeth of the clutch thereon slide with their inclined sides on the corresponding sides of the teeth on the clutch at the end 59 of the arm 51, and the sleeve 63 with the collar 61 thereon is thereby forced to slide on the shaft against the endwise pressure of the spring 64 until the teeth of the clutch on said collar 61 are disengaged from the teeth on the clutch at the end 59 of the arm 51. In other words, the above two clutches, when in engagement with each other, form a one-way clutch, which allows the turning of the collar 61 in one direction for increasing the torsion of the spring 64 without interfering with the arm 5159.

The torsional strain of the spring 64 may in this way be increased at will until the force exerted by said spring 64, through said collar 61, on the end 59 of the arm 51 is sufficient to cause the latter to open the cover 11. To prevent the cover 11 from being opened too violently, the spring 64 must not be strained excessively and unnecessarily.

To loosen the spring 64 or decrease the torsion thereof, the sleeve 63 with the collar 61 thereon may be slid by hand or by a suitable tool lengthwise the shaft 52 against the endwise pressure of the spring '64 until the clutch on the collar 61 is disengaged from the clutch at the end 59 of the arm 51; the collar 61 with the sleeve 63 are then allowed to be rotated by the spring 64 in a righthand direction to loosen the torsion of said spring, and the collar 61, with the clutch thereon, is then allowed to be moved by the endwise pressure of the spring 64 into engagement with the clutch at the end 59 of the arm 51.

When the cover 11 is released from the locking device, which is hereinafter described, the arm 51, under the influence of the spring 64, swings upwardly and rearwardly, turning in a clockwise direction in Figure 1 about the shaft 52 as a pivot, and it turns the cover 11 in the same direction about the hinges 12 as a pivot, by means of the roller 55 on the shouldered pin 56, which roller 55 is engaged with the sides of the slot 54 in said arm 51, as hereinbefore described.

The pin 56 and the roller 55 rotate with the cover 11, as above described, about the hinges 12 as a pivot, while the points on the side of the slot 54, which are in contact with the roller 55, turn about the shaft 52 as a pivot. The roller 55 with said pin 56, therefore, has a longer radius and also a higher linear velocity than said points of contact therewith on the sides of the slot 54 in said arm 51. The motion of the roller 55 and the pin 56 therefore has a component with relation to the arm 51 in the direction of the distal end of said arm 51. Said roller 55 and pin 56 are thereby caused, during said turning of the cover 11, to slide outwardly in 1-", eeegoee 3 momentum of the cover 11 will tend to carry it beyond the position to \"vh-i'ch the" spring 6 1- with' the arm 51 will bring itin-opposition to thectoroe of said spring, thereby straining the same in theopposite direction and thereby straining the connections of said cover with the arm, and of the arm With the spring and also of the spring with the body 10 of the casing. It may also strain the hinges l2, and it may even collide with the rear of the body 10 of the casing,'especially if the spring 64 beexcessively'strained initially to act promptly in opening the cover 11; 1

To prevent shocks, due to th'e momentum' as above described, a. shock-absorber is provided. The shock-absorber consists of a cylindricalextension or chamber 67 on the distal end of the arm 51, in which cylinder or chamber a piston or plunger 68 on" a rod 69 is adapted to move. Within the cylinder 67 is a coiled spring 70,- one end of which has bearing upon a stud 71 and the other end of which bears upon the piston or plunger 68. In Figure 1-, the piston or plunger 68 is shown as seated" against one end of the cylinder or chamber 67'. The rod 69 passes through the end of the cylinder or chamber 67 and into the slot 54, Where it lies in the path of the roller 55; VVhen the cover is opened, the roller 55 passes along the slot 54 until it engagesthe end ofth'e rod 69' and starts to compress the spring 70; From thispoint on, the spring 70, with rod 69 acts as a bufler, its resisting force increasing as it is oompres'sed'by the piston or plunger 68; The stud-7'1 againstv which the spring 70 bears, is'threaded', sothat, by turning the sanieQthe initial tensionof the spring 70 and strength of the buffer may be regulated. may serve as a stop to determine the open position or the cover 11. i

For locking the cover against the action of the spring-device, just referred" to, there pivoted at 72,- to one/of the side walls of the cover 11, a hook 723' which extends into the body partof the casing; When the'cover 11 is shut the hook 78 is swung forward by the spring 83' acting. on the rear thereofiand it engages a detent Tet,

carried by the casing-body 1'0. Mounted to be slidrearward andiorward inthe front wall of theca'sing-body 10 is pin 7'5, carrying on its outer end a finger-piece 76',- and having onits inner end a head 77, adaptedto' act on the end of the hook 73. heir the key or finger-piece 7 6 is pressed rearward; the pin 7 5 disengages the hook from the detent 7 1; and releases the cover 11 to the action of the opening device, heretofore de- The outer end of the slot 5% scribed: A sleeve 78, mounted in the casingafront'wa ll, serves" as a hardenedbearing for the pin 75. the 1n'aterialofthe casing itself may not be hard enough" to prevent undue wear by the pin and such wear might cause the pin tobeconie loose and inaccurate in its action. Inorder that the hook may not be Ill ured b; the t )e'wi'itin machine in the l l e operatioi'r of removing the latter from the casing; and may not be struck by the operator, orotherwise be be'nt'or injured; it is set in a housing; This housingis in two sectionsyone section 80 being-on the cover 11 and the other section 81, which forms a continuation of the section-"80 being on the casing body 10; As shown in Figure 1", the housing section 80 is of U-s'hapedsheetmet-algclosed atthe top, and the housing section 81 is likewise inthe form of a U- shaped piece of sheet-metal, open" at the top and' Cl OSBCl at the bottom by the offset side wall 50 Oi the body-portion 10 of the cas ing. Within the housing section 80 on'thc rear wall thereof is also at leaf-spring 823, which bears against the rear of the hook 753, as above described, and against the rear wall= of the housing section 80; and thus tends to throw the hook 73 forward into coverl'ocking position; The normal position of th'e'hook 73' is therefore a. forward position; and, in order that the hook may not interfere with the'closing of the cover; the upper forward edgeof the housing section 81 on" the casing-body 1 0is' slightly bent out as at at 84, to'i'orm" a" cam; which, by engagement With the nose of the hook as the cover l'lis'closed, will force the hook rearward to allow the sameto enter the housing section 81.- The nose of the hook may also be tapered, as at 855 to assist in this cannning operation. The head '?7 on the hook-acting end of the pin 75'not only sewe sta' s' a wide flat surface for operating the hookibutalso serves as shoulderto prevent the pin T5 from being ejected forward out 01 the casing-wall the spring-action of the hook and from falling out when the casing tilted.- The front and rear walls of the housing 8081' may serve as stops to limit thethrow oi the hook 7'3;

Variations may be resorted to within the scope of the invention, and portions of the improvements ma be used without others;

This is employed because Hit) and a coil spring anchored at one end to the casing and engaging and bearing upon the collar at its other end to cause the clutch on the collar to engage the clutch on the arm to cause the arm to swing on the shaft.

2. A sound-deadening casing for a typewriting machine, comprising a body-part, a cover hinged thereto, and a device tending to. open the cover; said opening device including an arm having a pin-and-slot engagement with the cover, a shaft on the casing-body, on which shaft the arm is pivoted, a clutch on the arm, a collar slidable and revoluble on the shaft, a clutch on the collar, and a coil spring anchored at one end to the casing and engaging and bearing upon the collar at its other end to cause the clutch on the collar to engage the clutch on the arm to cause the arm to swing on the shaft, the collar being slidable on the shaft to releasethe same from the arm, and, after being turned on the shaft, being re-engageable with the arm, to adjust the tension of the spring.

3. A sound-deadening casing for a typewriting machine, comprising a body-part, a cover hinged thereto, and a device tending to open the cover; said cover-opening device including an arm hinged to the casingbody, a pin on the casing-cover projecting into a slot extending lengthwise of the arm, and a buffer engage-able by the pin as the latter traverses the slot in the opening operation, to absorb shocks.

4:. A sound-deadening casing for a typewriting machine, comprising a body-part, a cover hinged thereto, and a device tending to open the cover; said cover-opening device including an arm hinged to the casingbody, a pin 011 the casing-cover projecting into a slot extending lengthwise of the arm, and a buffer including a plunger, actuable by the pin in the cover-opening operation, and a spring compressible by the plunger.

5. A sound-deadening casing for a typewriting machine, comprising a body-part, a cover hinged thereto, and a device tending to open the cover; said cover-opening device including an arm hinged to the easingbody, a pin on the casing-cover projecting into a slot extending lengthwise of the arm, and a buffer including a chamber formed on the arm, a coil spring in the chamber, a piston in the chamber against which the spring bears, and a rod for the piston extending into the path of the pin in said slot in the arm.

6. A sound-deadening casing for a typewriting machine, comprising a body-part, a cover hinged thereto, and a device tending to open the cover; said cover-opening device including an arm hinged to the easing-body, a pin on the casing-cover projecting into a slot extending lengthwise of the arm, and a buffer including a chamber formed on the arm, a coil spring in the chamber, a piston in the chamber against which the spring bears, a rod for the piston extending into the path of the pin in said slot in the arm, and means for adjusting the tension of the buffer-spring.

7. A sound-deadening casing for a typewriting machine, comprising a body-part. a cover hinged thereto, and a device tending to open the cover; said cover-opening device including an arm hinged to the casing body, a pin on the casing-cover projecting into a slot extending lengthwise of the arm, and a buffer including a chamber formed on the arm, a piston in the chamber, and a rod for the piston extending into the slot in the arm.

8. A sound-deadening casing for a typewriting machine, comprising a body-part, a cover hinged thereto, and a device tending to open the cover; said opening device including an arm having a pin-and-slot engagement with the cover, a shaft on the casing-body, on which shaft the arm is pivoted, a clutch on the arm, a collar slidable and revoluble on the shaft, a clutch on the collar, and a coil-spring anchored at one end to the casing and engaging and bearing upon the collar at its other end to cause the clutch on the collar to engage the clutch on the arm to cause the arm to swing on the shaft, the clutches on the collar and the arm when in engagement with each other forming a oneway clutch, said collar being turnable in a direction to increase the torsion of said spring without interfering with said arm.

9. A sound-deadening casing for a typewriting machine, comprising a body-part, a cover hinged thereto. and a device tending to open the cover; said opening device including an arm hinged to the body "of the casing, having a pin-and-slot engagement with the cover of the casing, and a spring for swinging the arm around its pivot, combined with a buffer carried by said arm to act upon said cover to check the rebound thereof and to absorb shocks to the casing in the cover-opening operation.

10. A sound-deadening casing for a typewriting machine, including a body-part and a cover for a machine hinged to said bodypart, a device on said body-part for opening the cover, including an adjustable actuating spring and an arm, one end of the arm secured to said spring for actuation by the spring and the opposite end of the arm provided with a longitudinal slot, a pin secured fast on the cover engaging said slot, means including a-spring-bufi'er on said arm acting during the operation of said opening device to abut against said pin, and dual means for adjusting the strength of said springs.

GEORGE W. CAMPBELL. 

